CSA B125.70:15 pdf download.Performance requirements for water temperature limiting devices
4.6.1 Data gathering (see Figure 1)
Data shall be gathered as follows:
(a) The temperature-recording device shall be started 10 s before the step changes.
(b) Temperature measurements shall be taken at temperature sensors T1, T2, and T3 with measuring equipment capable of detecting a 63.2% step change within 0.3 s with a frequency rate of 20 Hz (one value every 0.05 s) for 25±5 S unless otherwise specified in this Standard. See Annex B
(C) The outlet temperature measurements at sensor T3 shall be averaged every 0.25 s.
(d) Temperature sensors T1, T2, and T3 shall be located as follows:
(i) temperature sensors T1, T2, and T3, within the flow stream in Type K or Type L copper water tube;
(ii) temperature sensors T1 and T2, within 914 mm (36 in) of the device; and
(iii) for devices integral to a plumbing supply ftting, temperature sensor T3 shall be within 25 mm (1.0 in) of the discharge outlet to the fixture in the flow stream. For specimens with multiple discharges, the test shall be conducted for each discharge outlet except for the rim flush mode of bidet fittings. For all other devices, the maximum distance shall be 457 mm (18 in) from the outlet of the specimen.
The outlet tube shall be the same size as the outlet connection size of the device.
Note: For verifying the time constant of the temperature-measuring equipment, see Annex B.
4.6.2.3 The pressure changes specified in this section shall be accomplished in less than 1 s. In addition to the procedures specified in Clauses 4.6.1 and 4.6.2, the following test procedure shall be conducted:
(a) Decrease the hot water supply pressure by 20% to 248±14 kPa (36±2 psi). Observe and record temperature changes at the outlet temperature sensor T3 for 20±5 S after the first 5 s. Restore conditions as described in Items (a) to (g) of Clause 4.6.2.2.
(b) Increase the hot water supply pressure by 20% to 372±14 kPa (54±2 psi). Observe and record the temperature changes at the outlet temperature sensor T3 for 20±5 S after the first 5 s. Restore conditions as described in Items (a) to (g) of Clause 4.6.2.2.
(C) Decrease the cold water supply pressure by 20% to 248±14 kPa (36±2 psi). Observe and record the temperature changes at the outlet temperature sensor T3 for 20±5 S after the first 5 s. Restore conditions as described in Items (a) to (g) of Clause 4.6.2.2.
(d) Increase the cold water supply pressure by 20% to 372±14 kPa (54±2 psi). Observe and record the temperature changes at the outlet temperature sensor T3 for 20±5 S after the first five 5 s. Restore conditions as described in Items (a) to (g) of Clause 4.6.2.2.
(e) Increase the hot water temperature by 13.8°C±0.5 °C(25°F±1°F)ata rateof 3 °C±0.5 °C (5°F±1°F) per minute. Observe and record the temperature changes at the outlet temperature sensor T3 for 20±5 S after the first 5 s immediately after the hot water temperature increase is completed.CSA B125.70 pdf download.